[Purpose] This study aimed to determine static balance according to hip joint angle of
the unsupported leg during one-leg standing. [Subjects and Methods] Subjects included 45
healthy adult males and females in their 20s. During one-leg standing on the non-dominant
leg, the position of the unsupported leg was classified according to hip joint angles of
point angle was class. Static balance was then measured using a force plate with eyes open
and closed. The total length, sway velocity, maximum deviation, and velocity on the
mediolateral and anteroposterior axes of center of pressure were measured. [Results] In
balance assessment with eyes open, there were significant differences between groups
according to hip joint angle, except for maximum deviation on the anteroposterior axis. In
balance assessment with eyes closed, there were significant differences between total
length measurements at 0° and 30°, 60° and between 30° and 90°. There were significant
differences between sway velocity measurements at 0° and 30° and between 30° and 90°.
[Conclusion] Thus, there were differences in static balance according to hip joint angle.
It is necessary to clearly identify the hip joint angle during one-leg standing
testing.